Sarah is so irritated with her father: how dare he get remarried to a woman he has met online, and move her and her two sons, Marco and Nacho, into their California home. Having all of them go on the "honeymoon" together doesn't help, especially when adding three people to the package results in the group having to stay in a disgusting hotel and sharing a bed with her new stepmom. If only Sarah knew... the "luxury yacht" that they've booked is a worn out old boat, and when a storm hits, the family ends up stranded on a rather unnerving island. There's an abandoned house, but no sign of other people, and lots of disturbing things occur while the group is trying to rally forces to survive until they are rescued.
This had lots of good details about survival on an island, decent description of the difficulties of blending a family.