Can You ID this book?

We had a request for a title for a YA book from the 90s and we're drawing a blank on what it could be. I know there weren't too many YA books out at the time. My first guess was Christopher Pike, but none of the book covers I found matched the description.

Thanks!

It's a book I know I read in the 90s, and it had one of those old school
paperback size but hard cover books (no book flap). And it had the setting
of a beach-y type of setting, kind of dark book I thought for YA looking
back. It was part of a series, I believe. I think on the cover it had the
distant view of a lighthouse maybe and I think it was about some mystery on
the island. The main characters were siblings, I believe. The siblings were
on the cover but they were distant as well and not clearly shaped. It's not
the traditional book series I recall from that time like Boxcar Kids or
Nancy Drew or Hardy Boys for sure.

You might try the Name that Book group. Please be sure to read the Posting Tips in the group description—especially with regard to including a helpful subject line because everyone there is looking for a book.

Oh! Awesome. Thanks for the tip!

Sounds a bit like an Enid Blyton series, being reissued for the later 20th century.

>4 pickupf: maybe Five on a Treasure Island or Five on Kirrin Island Again. There are many covers - I seem to remember a "Five on Kirrin island", but that may be a mixture of these two